Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdfb7932b8f90b28…

MALICIOUS

PDF

35.1 KB Created: 2020-08-29 20:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 265ca1a50ed01d5b3baba4a920800640 SHA-1: 977f3e4aabeb7364383c8f467fe3efaa7778eced SHA-256: fdfb7932b8f90b2838a1378604707aad031506facc1baa7d943202421c1a8d96
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This URL is embedded within the document body, alongside numerous other links to Shopify-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The primary malicious link is designed to appear as a legitimate search result for 'sullair compressor manuals', indicating a social engineering lure. No scripts were extracted, but the presence of the malicious redirector is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/wix?keyword=sullair+compressor+manuals
    • https://cdn.shopify.com/s/files/1/0434/5597/1492/files/70802210900.pdf
    • https://cdn.shopify.com/s/files/1/0431/0247/0306/files/16712128019.pdf
    • https://cdn.shopify.com/s/files/1/0431/4152/9754/files/duxekebafakotenurajasotub.pdf
    • https://cdn.shopify.com/s/files/1/0433/6877/5841/files/writing_fractions_in_simplest_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/7016/7966/files/88287119278.pdf
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/anbanavan_asaradhavan_adangadhavan_video_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/2655/3755/files/napiparoforugirofutoga.pdf
    • https://cdn.shopify.com/s/files/1/0431/5050/8194/files/kadusutiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/6631/7205/files/dress_code_policy_sample.pdf
    • https://cdn.shopify.com/s/files/1/0429/6923/5619/files/aprendizagem_e_performance_motora_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0262/5178/files/kibasabisavasoka.pdf
    • https://cdn.shopify.com/s/files/1/0430/9444/2145/files/56679442757.pdf
    • https://cdn.shopify.com/s/files/1/0437/0615/5173/files/loop_antenna_calculation.pdf
    • https://cdn.shopify.com/s/files/1/0429/2299/9964/files/nirawude.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b53.bin
a6f5510f36fde6d141edf19a126036268277dd96e2062d2fdd8a8208b159d5ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B53 5180 bytes
font_01_sfnt_off00005ccf.bin
dcb826caba8c300d07ae557b63ef80c8d9ea3c95d7cd0dd48cf544d6a996fa73
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CCF 10364 bytes